The Truman Doctrine underpinned American Cold War policy in Europe and around the world. In the words of historian James T. Patterson, "The Truman Doctrine was a highly publicized commitment of a sort the administration had not previously undertaken. Its sweeping rhetoric, promising that the United States should aid all 'free people' being subjugated, set the stage for innumerable later ventures that led to globalisation commitments. It was in these ways a major step."
The doctrine endured, historian Dennis Merill argues, because it addressed broader cultural insecurity regarding modern life in a globalized world. It dealt with Washington's concern over communism's domino effect, it enabled a media-sensitive presentation of the doctrine that won bipartisan support, and it mobilized American economic power to modernize and stabilize unstable regions without direct military intervention. It brought nation-building activities and modernization programs to the forefront of foreign policy.

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Go to source: https://en.wikipedia.org/wiki/Truman_Doctrine